Why It’s Important to Know Your Film Camera Battery Type

Film cameras have been built for over half a century, and across that time manufacturers used many different power systems. Some relied on small button cells to run light meters, while later models used larger lithium batteries to power electronic shutters, motor drives, and autofocus systems.

Choosing the correct battery keeps your camera working accurately — maintaining proper exposure readings, shutter timing, and flash performance. Using the wrong type can cause underexposure, metering errors, or even damage to the circuitry.

Before installing any new battery, always verify your camera’s exact model and confirm the correct type through multiple trusted sources, such as the camera’s manual, manufacturer documentation, or reputable repair and collector websites.

Main Types of Film Camera Batteries

Most film cameras use one of the following four battery types:

1. Button cell batteries – used in light meters and manual SLRs.

2. Single lithium cells – found in later compact or autofocus cameras.

3. 6V lithium packs – common in electronic SLRs and advanced systems.

4. Mercury cells (discontinued) – once popular for their stability but now replaced with safe alternatives.

Let’s look at the details of each and how to choose a modern replacement.

SR44 and LR44 Batteries

Overview

The SR44 (silver oxide) and LR44 (alkaline) are small button cells widely used in SLRs and rangefinders from the 1970s and 1980s.

The SR44 provides a stable 1.55 volts throughout its life, which helps maintain accurate metering. The LR44, while cheaper, gradually drops voltage, causing less reliable results over time.

Best choice: SR44 or its direct equivalent SR44W (also known as 357 or A76).

Used in Popular Cameras

Pro tip: Always confirm whether your camera uses one or two cells, as even similar models can differ.

4LR44 and PX28A Batteries

Overview

The 4LR44 (also called PX28A) is a 6-volt cylindrical battery made by stacking four LR44-sized cells. It powers cameras with electronic shutters, light meters, or built-in motors.

A silver oxide version called 4SR44 provides longer life and better voltage consistency, especially useful for precision metering.

Common equivalents: PX28A, 4SR44, or 544 battery.

Used in Popular Cameras

Always check voltage and chemistry before buying. A silver oxide 4SR44 is preferable for consistent readings.

CR123A Lithium Battery

Overview

The CR123A is a 3-volt lithium cell used in many compact and electronic SLRs. It offers high power in a small size, perfect for autofocus and flash systems.

These batteries have an extremely long shelf life — often ten years or more — making them ideal for photographers who don’t shoot regularly.

Common equivalents: CR123, DL123, EL123.

Used in Popular Cameras

CR123A batteries remain widely available from major brands like Panasonic, Energizer, and Duracell.

2CR5 Lithium Battery

Overview

The 2CR5 is a rectangular 6-volt lithium pack designed for high-performance cameras with power-hungry features like motor drives and built-in flashes.

Its long-lasting charge and steady voltage make it ideal for autofocus film SLRs and point-and-shoot cameras from the 1990s.

Common equivalents: DL245, EL2CR5, 5032LC.

Used in Popular Cameras

Tip: Always buy name-brand lithium packs, as cheap knockoffs can leak or have inconsistent voltage.

PX625 Mercury Battery and Modern Alternatives

Overview

Many 1960s and 1970s cameras used the PX625 mercury cell, which delivered a very stable 1.35 volts — perfect for accurate metering. However, mercury cells are now banned for environmental reasons.

Modern options replicate this performance safely.

Safe replacements:

• Wein zinc-air MRB625 cell (1.35V, same behavior as the original).

• SR44 + adapter to adjust voltage and size.

• Custom adapters that regulate 1.5V down to 1.35V.

Used in Popular Cameras

Important: Do not insert a standard SR44 or LR44 directly without an adapter, as the higher voltage can make your meter inaccurate.

6V PX32 and 6V 544 Battery Packs

Overview

Large 6V packs such as the PX32 and 544 were used in early professional SLRs and motorized cameras. They provided more power for electronic shutters and winders.

Although less common today, modern lithium versions or 4LR44 adapters can serve as replacements.

Used in Popular Cameras

Always confirm the polarity and voltage requirements before substituting older batteries with adapters.

Battery Reference Chart

Best Practices for Using and Storing Film Camera Batteries

1. Confirm battery specifications through at least two independent sources before purchasing.

2. Avoid mixing old and new batteries in the same camera.

3. Remove batteries during long-term storage to prevent corrosion.

4. Keep spares in a cool, dry place, away from extreme heat or moisture.

5. Use the correct chemistry — silver oxide for steady voltage, lithium for power-hungry models.

6. Inspect contacts periodically and clean them gently with a soft cloth if tarnished.

These habits help maintain consistent performance and protect your equipment from battery-related damage.

Frequently Asked Questions

How do I find out which battery my film camera uses
Check your camera’s manual or battery door markings, then confirm online using trusted resources such as Camera Wiki or collector forums.

What replaces the old PX625 mercury cell
The best modern options are the Wein MRB625 or a silver oxide SR44 fitted with a voltage adapter.

Can I use alkaline instead of silver oxide batteries
You can, but silver oxide is recommended for consistent voltage and longer life.

Are CR123A and 2CR5 batteries the same
No. They differ in both shape and voltage output. Always use the correct type listed for your camera.

Can I use rechargeable versions
Only for certain lithium types like CR123A. Check compatibility before use.

How long do film camera batteries last
From several months up to multiple years, depending on usage, temperature, and whether the camera draws power when idle.

Conclusion: Powering Your Film Camera with Confidence

Understanding which battery your film camera requires ensures that your metering, shutter, and electronics work exactly as intended.

From reliable SR44 silver oxide cells to long-lasting CR123A lithium batteries, modern replacements are easy to find — as long as you verify compatibility before use.

Always double-check your camera’s requirements from multiple trusted sources before purchasing or installing a battery. With the right power source, your vintage camera will continue performing beautifully for many years to come.